Air-Stable Triazole-Based Ru(II) Complexes Catalyzed Transfer Hydrogenation of Ketones and Aldehydes Using Ethanol as a Solvent and a Hydrogen Donor
DOI:
https://doi.org/10.29356/jmcs.v68i4.2308Keywords:
catalysis, transfer hydrogenation, ruthenium, triazole, ethanolAbstract
The synthesis and characterization of two air-stable ruthenium (II) complexes from readily available triazole-based ligands are described. Both ruthenium complexes, one bearing a bidentate ligand (C-1) and the other a tridentate ligand (C-2), were tested as catalysts in the transfer hydrogenation of ketones and aldehydes using ethanol as a sustainable hydrogen source under aerobic conditions. Notably, the C-2 complex displayed exceptional efficiency under relatively mild conditions, demonstrating a wide substrate tolerance encompassing both alkyl and aryl ketones, as well as aryl aldehydes. Furthermore, our findings highlight the potential of Ru(II) complexes as effective catalysts for the hydrogenation of carbonyl bonds using ethanol, representing a green and sustainable approach without the necessity for an inert gas.
Resumen. En este trabajo se describe la síntesis y caracterización de dos complejos de rutenio(II) estables al aire con ligantes basados en triazoles. En general, los triazoles pueden obtenerse fácilmente a través de reacciones simples utilizando reactivos comercialmente disponibles. Ambos complejos de rutenio, uno con un ligante bidentado (C-1) y el otro con un ligando tridentado (C-2), se probaron como catalizadores en reacciones de hidrogenación por transferencia de cetonas y aldehídos, utilizando etanol como fuente sostenible de hidrógeno en condiciones aeróbicas. En particular, el complejo C-2 mostró una eficiencia excepcional en condiciones relativamente suaves, demostrando una amplia tolerancia tanto con cetonas alquílicas como aromáticas, además de hidrogenar eficientemente aldehídos aromáticos. Estos resultados ponen de manifiesto el potencial de los complejos de Ru(II) como catalizadores eficaces para la hidrogenación de enlaces carbonilo utilizando etanol, lo que representa un enfoque ecológico y sostenible sin necesidad de un gas inerte.
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